<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7; IE=EmulateIE9">
    <title>Highlighted Region</title>
    <!--[if IE]>
    <script type="text/javascript" src="../excanvas.js"></script>
    <![endif]-->
    <!--
    For production (minified) code, use:
    <script type="text/javascript" src="dygraph-combined.js"></script>
    -->
    <script type="text/javascript" src="../dygraph-dev.js"></script>

    <script type="text/javascript" src="data.js"></script>
  </head>
  <body>
    <p>Should draw a time series with an unusual region highlighted:</p>
    <div id="div_g" style="width:600px; height:300px;"></div>

    <p>When you zoom/pan, the region should remain highlighted.</p>

    <script type="text/javascript">
      // A basic sinusoidal data series.
      var data = [];
      for (var i = 0; i < 1000; i++) {
        var base = 10 * Math.sin(i / 90.0);
        data.push([i, base, base + Math.sin(i / 2.0)]);
      }

      // Shift one portion out of line.
      var highlight_start = 450;
      var highlight_end = 500;
      for (var i = highlight_start; i <= highlight_end; i++) {
        data[i][2] += 5.0;
      }


      var g = new Dygraph(
          document.getElementById("div_g"),
          data,
          {
            labels: ['X', 'Est.', 'Actual'],
            animatedZooms: true,
            underlayCallback: function(canvas, area, g) {
              var bottom_left = g.toDomCoords(highlight_start, -20);
              var top_right = g.toDomCoords(highlight_end, +20);

              var left = bottom_left[0];
              var right = top_right[0];

              canvas.fillStyle = "rgba(255, 255, 102, 1.0)";
              canvas.fillRect(left, area.y, right - left, area.h);
            }

          }
      );
    </script>
  </body>
</html>
